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Патент USA US2406727

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Aug- 27, 1946-
H. L. WETHERB'EE.
2,406,727’
COMBINED CHIMNEY AND BLOWOFF VALVE
Filed Aug. '7’, 1945
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4 Sheets-Sheet 1
Aug‘- 27; 1946-
H. L. WETHERBEE
‘2,406,727 _
COMBINED CHIMNEY AND‘ BLOWOFF VALVE
Filed Aug. '7, 1943
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4 Sheets-Sheet 2
Aug. 27, 1946-
H.‘ L. WETHERBEE
2,406,727
COMBINED CHIMNEY AND BLOWOFF VALVE
Filed Aug. 7, 1943
4 Sheets-Sheet 3
Aug- 27, 1946-
I
H. L. WETHERBEE
2,406,727
COMBINED CHIMNEY AND BLOWOFF VALVE
Filed Aug. 7,, 1943
" 4 Sheets-Sheet 4}
Patented Aug. 27, 1946
2,406,727
UNITED STATES PATENT OFFICE
2,406,727
COMBINED CHIMNEY AND BLOWOF'F
VALVE
Barry L. Wetherbee, Chicago, Ill., assignor to
Albert Mohr, Jr., and John P. Grilli, both of
Chicago, Ill.
1
.
Application‘August 7, 1943, Serial No. 497,728
5 Claims. (01. 137-144)
This invention relates to improvements in
chimney and blowo?‘ valves for controlling the
?ow of gases and air in the operation of blast
furnaces. In the manufacture of pig iron by
2
It is one of the objects of the present invention
to overcome all of these dii?culties and objec
' tions, and to provide an improved chimney valve
of this character, of the mushroom type, and an
means of a blast furnace, a large volume of air
improved blowo? valve, with improved mecha
must be blown through the furnace to promote
the combustion of coke in smelting the iron from
the ore. By pre-heating the air to a temperature
nism for actuating the same.
A further object is to provide a combined blow
the resistance of the ore, coke, etc., in the fur
off and chimney valve, each of which is adapted
to be employed individually and independently
with respect‘to the other, or in combination with
each other, and at the same time provide a struc
nace, commonly known as the furnace burden, a
ture which is of “a simple construction and com
of from 12000 F. to 1600° F., a considerable saving
in the amount of fuel required will result. Due to
pressure of from 16 to 20 pounds, or even more,
pact arrangement, which may be installed and
.per square inch is required to force the air into
maintained at an expense which is considerably
the furnace, and this necessitates the ‘employ 15 less than the cost of installation and mainte
ment of blowing engines.
‘
‘
.
nance of similar valves now employed for this
To pre-heat the air, stoves are used, and such
purpose.
,
~
~
“
heating has been accomplished by burning gases,
A ‘further object is to provide, as a. unitary
which are passed through checkers that absorb
structure, a combined chimney and blowoif valve,
the heat. After the checkers have reached a 20 each of which is provided with its individual
sufficiently high temperature, the burning gas is
operating mechanism.
shut off by the manipulation of proper valves,
A still further object is to provide an improved
and the stove is connected to the air supply. The
combined chimney and’ blowoff .valve, comprising
air thus supplied is then passed through the
a plurality of valve elements arranged within
heated checkers and is thereby heated to the de V26 each other, and in which some of the valve
sired, or required, temperature before it is deliv
elements are provided with positive actuating
ered to the blast furnace, the products of combus
means individual thereto. Another of the valve
tion being removed from the stove through a
elements is adapted to be actuated with respect
stack or chimney.
to certain of the other valve elements, automat
Between the stove and the chimney these prod
ucts pass through, and are controlled by a chim
ney valve, and While the stove is on gas and
the products of combustion are , passing off
through the chimney valve and through the stack
or chimney, the entire system will be at atmos-'
pherie pressure.
p
‘
While the stove is on air, that is, when air is
being blown through the heated checkers, it is
necessary to tightly close or seal the stove, such
as by means of suitable valves, in order to con
?ne the high pressure of the air delivered into
the furnace.
7
‘
After the air has absorbed the heat from the
checkers in the stove, and to again put the stove
30
ically, by ?uid pressure, whereby to permit the
passage of ?uid from that side of the valve prop
er on which the greatest ?uid pressure exists, to
the other side thereof, to counterbalance or equal
ize the pressure of ?uid against the valve proper,
' thereby rendering it possible to shift the valve
proper with respect to its seat, to open the valve.
To the attainment of these ends and the ac
complishment of other new and useful objects as
will appear, the invention consists in the features
40 of novelty in substantially the construction, com
bination and arrangement of the several parts,
hereinafter more fully described and claimed and
shown in the accompanying drawings illustrat
ing this invention,‘ in which
' on gas to reheat the checkers, certain valves must
' Fig. 1 is a vertical sectional view of a combined
be opened and closed. Due to the‘ pressure of
air in the stove, large valves could not be read
chimney and blowoff valve, constructed in ac
cordance with the principles of this invention,
and‘ showing the valve in a closed position to pre
vent the flow of ?uid through the air conduit.
ily moved; therefore, to render it possible to
actuate the valves, the pressure inside of the stove
must be reduced to, or near, atmospheric pres-' 50
Fig. 2 is a detail sectional view of the valve,
sure, and for this purpose a blowoff valve is em
showing the main valve in a closed position and
ployed. These valves have heretofore been sep- ,
the pilot valve in an open position.
arate from each other, and have been expensive
to install, requiring considerable space for instal
lation.
.
.
»
Fig, '3 is a view similar to Fig. 2, showing the
parts of the valve in a different position.
Fig.4 is a vertical sectional view of the valve
2,406,727
r.
a
housing, showing the valve in elevation, and in
a fully open position to permit ?ow of air through
the conduit.
Fig. 5 is a side elevation taken from the out
side of the valve casing, and showing part of the
operating mechanism for the valve.
Fig. 6 is a detail top plan view of a portion of
the valve operating mechanism.
Fig. '7 is a diagrammatic view, partly in ele
vation and partly in section, showing the oper
ating mechanism for the blowoff valve.
Fig. 8 is a vertical sectional view of a modi
?ed form of the invention.
Fig. 9 is a right-hand end elevation of Fig. 3,
showing parts of the operating mechanism for
the valve, in section.
Referring more particularly to the drawings
and to the form of the invention shown in Figs.
1 to "I, the valve mechanism consists essentially
of a casing l5 which is arranged between the
stove and the chimney, the casing being prefer
ably provided with a flange l6 whereby it may be
secured in position. The other end of the cas
ing I5 is connected with the chimney or stack ll,
a suitable element 18 being arranged therebe
tween to constitute a valve seat.
A
stack or chimney and the conduit I‘! will be closed,
and pressure will be exerted upon the top of the
main Valve to hold it in a closing position. Due
to the excess of pressure on this side of the valve
as compared with that which exists on the other
side of the valve, it is difficult to unseat the
main valve 23 so as to permit the ?ow of air from
the stove into the conduit l'i. Therefore,in order
to be able to open the valve 23, this excess pres
10 sure must be relieved.
It will be noted that when the parts are in the
position shown in Fig. 1, the ?uid pressure on
‘ the upper side of the main valve will leak through
the openings 28 into the cylinder 24 and hollow
or blowoff valve 2‘! to hold this valve
15' piston
closed, and as the pilot valve 34 will also be closed,
In lieu of this
element IS, the valve seat may, if desired, be
formed as a part of the casing 55. The casing i5
is provided with an open side is closed by a suit
fluid pressure will be exerted upon the top of the
valve 34 to assist in holding it in its closed posi
tion. However, as the top of the valve 34 is of a
comparatively small area, the pilot valve may be
more readily moved against such ?uid pressure.
Therefore, when it is desired to open the valve
23, the pilot valve 34 is moved from the position
shOWn in Fig. 1 to the position shown in Fig. 2.
The fluid pressure will thenv be relieved through
the openings 3! and 33 and, at the same time, the
fluid pressure will operate upon the under side as
well as the surface 21a of the piston or blowoif
valve 21 to assist in moving it from the position
able closure 25, in which latter may be provided 30 shown in Fig. 2 to the position shown in Fig. 3,
thereby unseating the valve 21 to permit the ?uid
a manhole or opening 2! which is, in turn, closed
pressure to be exerted through the opening 25 in
by a suitable closure 22.
the main valve element 23. When this pressure
The chimney valve proper consists of a main
is thus relieved, the main valve element 23, to
valve element 23 which may be of any desired con
gether with all of the other parts of the valve
?guration, but is preferably slightly concave, and
element,
may be readily moved from the position
is adapted to engage and rest upon the valve seat
shown in Fig. 1 to the open position shown in
18. A portion of the main valve 23 is shaped to
Fig. 4, to permit the air to ?ow from the stove
form a cylinder 24 which is preferably open at its
into the conduit or stack l1.
bottom, and preferably terminates a substantial
Any suitable means may be provided for open
distance above the bottom of the main valve 23, 40
ing the pilot valve 34, but a simple and e?icient
and in alinement with an opening 25 there
means embodies a shaft 31 which is suitably
through (see particularly Fig. 3), and a valve seat
mounted in the valve casing and is provided with
26 encompasses the opening.
an arm 38, to the forward end of which arm is
Reciprocable in the cylinder 24 is a piston or
blowoff valve 21. which is preferably hollow and . \} pivotally connected, as at 39, a link 48. The other
end of the link 4%] is pivotally connected, as at 41,
may be provided with openings 28 through the
to the end of the pilot valve stem 35, so that by
wall thereof. This piston constitutes a portion of
rocking the shaft 37 by means of a handle 42,
a blowoff valve, and is itself provided with open
ings 3! through its bottom, and is also preferably
provided with a bearing 29. Any number of these
openings 3| may be provided, for a purpose to be
later described. Supported by the valve mem
ber 21 is a member 32 which is also hollow and
is provided with an opening 33, the wall of which
latter forms a valve seat. This opening 35-! is
preferably in alinement with the opening 35)
through the bearing element 29, and the open
ings 3| in the bottom of the valve member 2'!
are provided for the purpose of relieving the pres
which latter is arranged on the outside of the cas
ing, and readily accessible, the pilot valve 35 may
be raised or unseated. This valve 35, when raised
from the position shown in Fig. 1, may be held
in any open position in any suitable manner, such
as by means of a latch 43 pivotally mounted,
.. as at 44, and which is provided with a seat 45
adapted to be engaged by a shoulder 45 on the
handle or lever 42, as shown more clearly in
Fig. 7. When the valve is unseated by raising
the shoulder 46, thelatch I33 may be swung into
sure within the cylinder 24, in a manner and for 60 the dotted line position shown in Fig. 7. When
the pilot valve is to be closed, the latch 43 may
a purpose to be later set forth.
be turned into an inoperative position to rest
A pilot valve 34 is provided for controlling the
upon a suitable support 41.
opening ‘33, and this valve 34 is provided with
The main valve section, together with all of
a stem 35 which passes through the bearing 29,
the other valve elements, may be opened in any
and also through a bearing 36 in the cylinder 24,
suitable manner, and for that purpose there may
and through the top of the cylinder. The pilot
be
provided a shaft 48 which may telescope with
valve is adapted to be moved from the position
the shaft 31, and secured to this shaft 48 is an
shown in Fig. 1, where it closes the opening 33,
arm 49, upon the forward end of which a yoke
to the position shown in Fig. 2, to uncover the
shaped
member 55 is mounted in such a manner
opening 33, and the opening movement of the 70
as to provide a swivel action of the yoke-shaped
pilot valve may be controlled by reason of the
valve2 34 abutting the bearing 29, as shown in
Fig.
.
When all of the parts of the valve are in‘the
' member with respect to the arm.’ This may be
accomplished by means of a bolt or fastening '
member 5! which passes through the bottom
position shown in Fig. 1, the passagebetween the 75 of the yoke and into the arm 49. The link 40- be
2,406,727
tween the arm 38 and the pilot valve 35 is prefer
stove into the conduit IT. This will cause a re
ably arranged within the yoke, and the arms of
the yoke may be pivotally connected, as at 52,
duction of pressure upon the top of the valve
23, rendering it possible to open this valve by
with a portion of the main valve element 23. The
merely swinging the weighted arm 56 from the
‘purpose of this swivel connection» is to compen 5 full line position to the dotted line position shown
‘sate, for any unevenness or irregularities in the
in Fig. 5., Before the pilot valve 34 is opened,
valve seat [8 and. the valve and to insure that
the valve element 23 will be properly seated when
the valve is closed.
.
‘ ?uid pressure will leak through the openings 28
into‘ the ‘cylinder 24, to assist in maintaining the
_
blowolf valve 21 in a closed position.
The shaft 48, which is connected to the main :10 . When the pilot valve 34 is ?rst opened,‘ it may
valve element 23 by means of the arm 49, may
be locked in its open position by the mechanism
‘be rocked in any‘suitable manner. A simple and
shown in Fig. 7. Thereafter, when the ?uid pres
e?icient means embodies a. segmental-shaped
sure is reduced sufficiently to permit the valve 23
member 53 which is secured tothe shaft outside
to be .opened by the swinging of the arm 56, the
of the valve casing l5. Pivotally mounted upon
pilot valve 34 will be carried with the main valve.
a support 54, such as a stub shaft mounted upon
In the form of the invention shown in Figs.
the valve casing, is another segment 55, toHWhich
8 and 9, the pilot valve ‘65 is similar to the pilot
latter an arm 56 is connected, and adjustably
.valve 34, and the stem 61 thereof passes through
mounted upon the arm 55,is a weight 51 which
the top 68 of the valve casing 69, a suitable pack
may be held in‘its adjusted position by means 20 ing 10 being provided for the valve stem. The
of a fastening device 58. A handle 59 may be
end of the valve stem is connected, by means of
provided for swinging the segment. 55 about its
a
coupling ‘H, to a ?exible member 12 which,
pivot 54.
'
V
passes over a pulley 13 swiveled, as at ‘I4, to a
7 One end of a ?exible member 63 passes over
support 15. The other end of the ?exible mem
the segment {53 and is adjustably anchored by
ber 12 is wound upon a drum 13a, and the free
means of an adjustable fastening device 64. The
end of the ?exible member 12 is connected, by
other end of the ?exible member 60 passes over
means of a connecting device 14a, with a Weight
the segment 55 and is adjustably anchored with
15a that slides in a casing 16.
.
‘respect to the segment by means of an adjustable
Connected to the shaft of the drum 13a is an
fastening device 65.
.
With this construction, it will be manifest that,
30 other drum or pulley 11, over which a ?exible
member 18 is wound, and the other end of the
flexible member 18 passes over a drum 19 J'our
naled in a bracket 80, and the drum 19 is adapt
‘ assuming the parts to be in the position shown
in Fig. 5, the main valve section will be closed.
When the pressure is relieved upon the main
ed to be rotated by means of ahandle 8| having
valve section so as to permit it to be opened, the 00 (AI a suitable connection whereby, upon rotation of
segment 55 may be swung about its pivot 54 by
the'handle, the drum will be rotated.
grasping the handle 59 and moving the arm‘56
In this form of the invention the main valve
from the position shown in solid line to the posi
sections operate in the same manner as in the
tion shown in dotted line, in Fig. 5. This will
other form of the invention, with the exception
cause the ?exible member 60 to be wound upon 40 that the pilot valve 63 is ?rst unseated by opera
the segment 55, and thisin turn will rock the seg
tion of the handle BI and the turning of the drum
ment.53 about its pivot to open the valve.
19 which rotates the drum 13a, to permit the
In the ‘operation of the closing of the main
?uid pressure to ?ow beneath the piston or blow
valve section, the turning moment of the valve
voff valve 21 to unseat it. Thereafter, when the
is greater than the turning moment of the coun
?uid pressure is equalized upon the main valve
terweight ‘51, thus maintaining the valve in a
section 23 topermit it to be opened, the opening
closed position without the bene?t of air pressure
‘operation is accomplished by further actuating
in the stove. When the valve is open, that is,
the handle 8| and rotating the drum 13a to cause
when it is in the position shown in Fig. 4, the
the pilot valve 66 to raise and unseat the main
closing turning moment of the valve is less than 50 valve section 23. In other words, in this form of
the opening turning moment of the counter
the invention av single positive actuating means
weight 51, thus maintaining the valve in an open
is provided for ?rst opening the pilot valve, and
position, without the need of latches, pins, or
then, subsequently thereto, unseating the main
other locking devices, and therefore the angles
of the segments are correspondingly constructed,
and may, if desired, be eccentric
It is thought that the operation of this form
of the invention will be clearly understood from
the foregoing description, but, brie?y stated, it
is as follows:
When the parts are in' the position shown'in
Fig. 1, the valve 23 is closed, and the pilot valve
34 is also closed. To open the valve 23, it is
necessary to reduce the pressure on the upper
side of the valve. This is accomplished by open
ing the pilot valve 34, that is, by moving it from
the position shown in Fig. 1 to the position shown
in Fig. 2, so that the ?uid pressure above the
valve will ?ow through the openings 28, and
thence through the opening 33. The ?uid pres
sure will then operate upon the bottom of the
piston or blowolf valve 21, and Will move it from
the position shown in Figs. 1 and 2 to the position
shown in Fig. 3, thereby opening the passage 25
to permit the?uid pressure to ?ow from the
.valve section. .
55
i
A stop device 32 may be provided and arranged
in a casing 83, to limit the movement of the
weight, 15a in one direction.
When desired, the .blowoff and‘pilot valves may
be employed as. a unit byomitting the main valve
section, and the latter, which constitutes the
chimney valve, will be separate therefrom. In
this instance the valve section 21 will co-operate
directly with a valve seat which may be formed
as a part of the air conduit. That is, instead
of the main valve section or chimney valve 23
being a part of the unit movable with the blow
off valve, a stationary seat for the valve section
21 may. be provided, just as though the section
23 were stationary. The chimney valve may then
be located at any point, but the blowoff and pilot
valves would serve the ‘same function, that is, to
reduce the pressure to permit the main valve to
be opened.
While the preferred forms of the invention have
75 been herein shown and described, it is to be un
2,406,727
7
derstood that various changes may be made in
the details of construction and in the combina
tion and arrangement of the several parts, with
in the scope of the claims, without departing from
the spirit of this invention.
What is claimed as new is:
,
'
l. A combined chimney and blowoff valve of the
character described, embodying a main valve ele
ment {or closing an air conduit, said valve ele
ment being acted upon on one side by ?uid pres
sure to hold the same closed and having a pas
sage therethrough, a second valve element for
8
passage in the main valve element which is con
trolled thereby, to reduce the fluid closing pres
sure upon the main valve element to permit the
latter to be opened, means for thereafter open
ing said main valve element, the said means for
opening said main valve element embodying a
shaft connected with the last said element, a
segment connected with the shaft, a pivotally
mounted segment spaced from the ?rst said seg
10 ment, a ?exible element anchored to both of
the segments, and an'actuating handle connected
with one of said segments.
,
4. A combined chimney and blowoif valve of
the character described, embodying a main valve
element for closing an air conduit, said valve
closing position, a pilot valve for controlling a 15
element being acted upon on one side by ?uid
passage through the said second valve element,
pressure to hold the .same closed and having a
means for opening said pilot valve whereby to
passage therethrough, a second valve element for
permit said ?uid pressure to act upon the other
closing said passage, the last said element being
side thereof to assist in shifting the said second
acted upon by said fluid pressure to hold it in a
valve element to open the passage in the main 20 closing position, a pilot valve for controlling a
valve element which is controlled thereby, to re
passage through the said second valve element,
duce the ?uid closing pressure upon the main
means for opening said pilot valve whereby to
valve element to permit the latter to be opened,
permit said ?uid pressure to neutralize the effect
means for thereafter opening said main valve
of the ?uid pressure which holds the valve closed,
element, and a substantially universal connection 25 thereby reducing the force required to open the
between said main valve element and the said
passage in the main valve element which is con
operating means therefor.
trolled thereby, to reduce the ?uid closing pres
2. A combined chimney and blowoif valve of
sure upon the main valve element to permit the
the character described, embodying a main valve
latter to be opened, means other than the open
element for closing an air conduit, said valve ele— 30 ing means for the pilot valve for thereafter open
ment being acted upon on one side by fluid pres
ing said main valve element, the said second
sure‘ to hold the same closed and having a pas
valve element embodying a cylinder and piston,
sage therethrough, a second valve element for
and means whereby the said fluid pressure is ad
closing said passage, the last said element being
mitted between the piston and cylinder to assist
acted upon by said fluid pressure to hold it in a
in holding the said second valve element seated.
closing position, 'a pilot valvefor controlling a
5. A combined chimney and blowoff valve of the
passage through the said second valve element,
character described, embodying a main valve
means for opening said pilot valve whereby to
element for closing an air conduit, said valve
permit said ?uid pressure to assist in shifting the
element being acted upon on one side by ?uid
40
said second valve element to open the passage
pressure to hold the same closed and having a
in the main valve element which is controlled
passage therethrough, a second valve element for
thereby, to reduce the fluid closing pressure upon
closing said passage, the last said element being
the main valve element to permit the latter to
acted upon by said ?uid pressure to hold it in
be opened, means for temporarily locking said
a closing position, a pilot valve for controlling a
pilot valve in its open position, and means for
passage through the said second valve element,
thereafter opening said main valve element.
means for opening said pilot valve to reduce the
3. A combined chimney and blowo? valve of
?uid closing pressure upon the main valve ele
the character described, embodying‘a main valve
ment and to permit said pressure to act upon
element for closing an air conduit, said valve
the said second valve element to permit the main
element being acted upon on one side by fluid ‘r
valve to be opened, means for thereafter open
pressure to hold the same closed and having a
ing said main valve element, the said means for
passage therethrough, a second valve element for
actuating said main valve section embodying a
closing said passage, the last said element being
shaft, an operative connection between said shaft
acted upon by said ?uid pressure to hold it in
and said main valve section, an arm connected
a closing position, a pilot valve for controlling
with said shaft for actuating the latter, and a
a passage through the said second valve element,
counterbalancing weight adjustably connected
means for opening said pilot valve whereby to
with
said arm.
permit said ?uid pressure to neutralize the effect
HARRY L. WETHERBEE.
of the ?uid pressure which holds the valve closed,
thereby reducing the force required to open the 60
closing said passage, the last said element being
acted upon by said ?uid pressure‘to hold it in a
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